Preheater.



, *9 a NTOR WITNESSES 9 7 mwvmk v A TTORNE Y I PatentedSept.14,'1915. v

UMTED STATES PA'rEnr ent ies.

SAMUEL H. TiCY, OF ELKINS PARK, PENNSYlllivatsl li l ASSIGNOR 'IO FEE-HEATED AIR COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF DELA- WARE.

PREHEATER.

Specification of Letters Patent.

Patented Sept. 14, 1915.

, To all whom it may concern Be it known that I, SAMUEL H. TAoY, a citizen of the United States, and a resident of Elkins Park, Pennsylvania, have invented a certain new and useful Preheater, of which the following is a specification.

, invention relates to pre-heaters intended to be secured in operative position within a furnace and which I prefer to mount upon the furnace door to swing positively therewith.

The purpose of my invention is to provide a series of connecting, desirably straight, passages in such a pre-heater in a construction having as great an extent of surface for heating as possible at the end toward the fire, and to distribute the air therefrom, preferably through a number of openings at an angle to each other and above the fire.

A further purpose of my invention is to place as much of the preheater close to the fire as possible in a pre-heater having end, as opposed to side air inlet, and to secure in this construction successively increased areas of cross section from the inlet to the hereof.

time well illustrates the theory of my invention.

Figure 1 is a vertical section of a per missible furnace door and alley construction showing the preferred form of my invention in position. Fig. 2 is a vertical central longitudinal section of the form of preheater shown in Fig. 1. Fig. 3 is atop plan view, partly in section, of the structure of Fig. 2 without the top plate. Fig. 4 is 'a side elevation of a modified form of my invention.

Similar numerals of reference indicate like parts in the specification.

Any suitable furnace door such as 1 may be conveniently used as a mount for my preheater, and in the illustration, I have sepreferably rigidly supported to swing with the door by means of its air inlet pipe.

The lower plate 5 of my pre-heater preferably lies in a horizontal position and is shown as carrying the partition portions and side walls in Figs. 2 and 3. 6 is shown to be secured to the bottom portion of the pre-heater by any suitable means 7, so as to engage the outeredges of the partitions and side walls, making the spaces between the partitionsefiective as passages. These spaces between the side walls are shown as communicating and arranged in such order that the relatively cool inlet air passes first through the [mssage 8 against the outside wall 9, thence, in reverse direction, through passage 10, and, in successively reversed directions. through passages 11 and 12, respectively. All of the passages so far indicated are preferably parallel and at an angle to the group'of passages upon the opposite sideof the pro-heater. so that one set of passages shall be parallel to the outer side wall 9, while the other set of passages paralle the outer side wall '13. The latter set of 1. ..ssages, in which the air moves in successively reversed directions is indicated at 14, 15 and iii. The air from the passage 12 enters passage ll, and that from passage 16 is conducted through the trans verse passage 17 and passage '18 into the end The top plate space 19, whence it is discharged, preferably at a plurality of angles. through the end apertures 20. It will thus be evident that the air is subjected to a greater heat relatively when first admitted and just prior to its delivery to the furnace than during its intermediate travel, notwithstanding that the air in each passage receiycs substantially the same heating eflect from the top and bottom plates. I

The tapered shape of my pro-heater, with the wider end toward the fire, gives the greatest width at that part of the pro-heater which is nearest to the fire, to considerable advantage in heating the same.

In the form shown in Fig. 4: the pre-heater may be held at an angle to the axis of the alley by pipe 3, and" the end is provided with an enlargement.

It will be evident that the successively re versed directions of air flow are quite desirable in any form of heater other than circular, and that the form shown possesses considerable advantage in efiiciency by reathe outlet slightly Wider than the preceding passage, to provide for the increase of air volume with increased temperature, and have succeeded in effecting this in a balanced form of tapered pre-heater without sacrifice of eiliciency in the form illustrated.

Having thus described my invention, what 1 claim as new and desire to secure by Let ters Patent is: v

'l. In a device of the character stated, a furnace door and a pre-heater mounted thcreon'ot tapered external shape, having an inlet air connection, outlet air apertures and longitudinal air passages alternately reversing in direction of air travel and parallel to the nearer tapered walls of the heater.

2. in a device of the character stated, a pro-heater having tapered side Walls, an inlet connection, o'utlet apertures and communicating passages of successively increased cross section from the inlet to the discharge opening, said passages being substantially parallel each to the nearer sidewall alternating in direction, those at the center diverging to provide tor the substantial parallelism with different side walls.

3. in a device of the character stated, an inlet air connection, a tapered pre-heater, fed therefrom, of approximately rectangular substantially parallel with one of the relatively tapered walls and communicating with passages substantially-parallel with the other relatively tapered Wall, which latter passages are in communication with outlet openings at the front of the pre-heatcr.

5. In a device of the character stated, a pre heater adapted for attachment to a furnace door, of substantially rectangular cross section and having two walls relatively tapered, the Walls converging toward the door, an inlet connection therefor, passages ad3o1n1ng one of SZIId IElPBI'Gd Walls substantially parallel with it and passages adjoining the other wall substantially parallel with said second tapered wall, said passages communicating at the middle, and outlet' openings at the larger front end of the preheater.

SAMUEL H. TACY.

Witnesses:

HELEN I. KAUFFMAN, WM. S'rnELL JACKSON.

end provided with discharge apertures u- 

